Switch-operating mechanism



July 16, 1929. M. KAMINSKY SWITCH OPERATING MECHANISM H E m n f 1 f a .m m

Filed Feb. 28, 1928 ATTORNE Patented July 16, 1929.

UNITED STATES MICHAEL KAMINSKY, OF NEW BRITAIN, CONNECTICUT.

SWITCH-OPERATING MECHANISM.

Application filed February 28, 1928. Serial No. 257,677.

This invention relates to switch-operating devices, and more particularly to a pedaloperated switch mechanism for controlling an electric motor-driven machine.

The objects of this invention are to provide a device of this nature which will be simple in construction, inexpensive to manufacture, easy to install and manipulate, compact, ornamental in appearance, and very eificient anddurable in use.

With these and other objects in view there has been illustrated on the accompanying drawings one form in which the invention may be conveniently embodied in practice.

Fig. 1 represents a front viewof the switchoperating device.

- Fig. 2 is a side view of the same showing the mechanism for attachment to the switch cas- T ig. 3 is a rear view of a motor-driven sewing machine showing the invention installed in operating position.

Referring now to the drawings in which like reference numerals denote corresponding parts throughout the several views, the numeral 10 indicates a switch casing which is preferably substantially rectangular in shape and is provided with a pair of rearwardlyextending bolts 11 and 12 adapted to be passed through the frame 13 of a sewing machine and to be secured to said frame, as by a plate member 14 and a pair of nuts 15, as clearly .shown in Fig. 2. The switch is connected with the motor 42 by a pair of conductors 16 leading into the side of the casing 10, and said I switch is actuated by a swinging arm or lever In order to support the operating mechanism upon the switch casing 10, provision is made of a'fixed vertical plate 18 having apertures for. receiving screws 19 and 20 which are adapted to be driven into said casing. The

vplate 18 is provided at its opposite vertical sides with forwardly and inwardly bent flanges 21 and 22 which serve as guides for a movable plate 23. The upper end of said plate 18 has a forwardly extending lug 24 having an aperture 24 for receiving the upper end of a spiral spring 25.

The fixed plate 18 is provided at its center with. a rectangular aperture 26 for permitting the switch-actuating lever 17 to swing freely, The sliding plate 23 is rectangular in shape and is provided at its central portion with a. pair of struck-out forwardly-extending curved clamping jaws 27 and 28 which are adapted to resiliently engage the upper and lower sides of the lever 17. The sliding plate 23 is also provided at its upper and lower ends respectively with forwardly bent curled'hooks 29 and 30, the hook 29'being adapted to hold one end of the spiral spring 25, while the hook 30 serves to hold a downwardly depending triangular loop member 31.

In order to form a resilient and adjustable connection between the loop member 31 and a control pedal 32 locate-d under the sewing machine, provision is made of a helical resilient spring 33, preferably made somewhat stronger than the spring 25, being connected at its upper endto the loop member 31 and at its lower end to an eye bolt 34, screwed into the upper end of a turn buckle 35. The lower end of the turn buckle 35 is provided with a second eye bolt 36, the threads of which are of opposite pitch from those of the eye bolt 34.

The lower eye bolt 36 is connected in any suitable manner, as by a wire member 37'to a U-shaped clamping member 38 which is adapted 'to surround a rearwardly extending rod 39 on the pedal 32. The clamping member 38 is securely'held upon said rod 39 by a bolt 40 and a nut 41. A lock nut 43 is located on the lower eye bolt 36 for holding the turn buckle 35 from twisting out of adjusted position.

In operation, when it is desired to close the switch for starting the motor, it will only be necessary for the operator to press down upon the pedal 32 with his foot, whereupon the wire 37, the adjustable turn buckle 35, the resilient spring 33, and the triangular loop 31 will be pulled downwardly, causing the plate 23 to slide downwardly upon-the fixed plate 18 within the guide flanges 21 and 22.

This will cause the switch lever 18 to move downwardly and close the switch of the motor 42.

It will be understood that the operator will hold the pedal 32 down as long as he desires ified and embodied in various other forms without departing from its spirit. In short,

the invention includes all the modifications 1 and embodiments coming within the scope of the following claims. c

Having thus fully described the invention, what is claimed as new, and for which it is desired to secure Letters Patent, is:

I cured to said casing and 1. 'In an attachment for a motor-operated machine, a switch casing, a switch mounted in said casing, a switch-actuating lever profleeting out of said casinfi, a fixed plate seavm an aperture surrounding said lever, a mova 1e plate slidable on said fixed plate and having a pair of lever-clamping lugs struck up from the interior thereof, and a pedalconnected to said MICHAEL 'KAMINSKY. 

